Since there’s no more work to do, we might just ________ go home

I hope, first of all, that we shall never lose _____heart in face of _____ failure.

When the teacher asks him, he always ____.

When he was alive, the old scientist used to say that knowledge ＿＿from practice and he gained his experience by doing a lot of practical work

_______ is it from your home toschool? ––Five kilometers.